Crossword Genius

Island forming a ring (5)

Ross

I believe the answer is:

atoll

'island' is the definition.
(thesaurus)

'a ring' is the wordplay.
'ring' becomes 'toll' (tolling is a kind of ringing).
'a'+'toll'='ATOLL'

'forming' acts as a link.

(Other definitions for atoll that I've seen before include "tropical island" , "Ring-shaped coral reef enclosing a lagoon" , "String of islands" , "Bikini, perhaps" , "Coral island(s) surrounding a lagoon" .)

I've seen this clue in The Independent.
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